399180401 has 8 divisors (see below), whose sum is σ = 406075944. Its totient is φ = 392296320.

The previous prime is 399180377. The next prime is 399180409. The reversal of 399180401 is 104081993.

It can be written as a sum of positive squares in 4 ways, for example, as 10144225 + 389036176 = 3185^2 + 19724^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399180401 - 2¹⁰ = 399179377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399180409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96365 + ... + 100421.

It is an arithmetic number, because the mean of its divisors is an integer number (50759493).

Almost surely, 2^399180401 is an apocalyptic number.

It is an amenable number.

399180401 is a deficient number, since it is larger than the sum of its proper divisors (6895543).

399180401 is a wasteful number, since it uses less digits than its factorization.

399180401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 399180401 is about 19979.4995182562. The cubic root of 399180401 is about 736.3027175364.

The spelling of 399180401 in words is "three hundred ninety-nine million, one hundred eighty thousand, four hundred one".